Question

1) define Atomic Mass unit. what is it's symbol?

2) Define Atomic Mass of an element

3) what is meant by saying that 'the Atomic Mass of oxygen is 16?'

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Answer 1

Answer:

1.In chemistry, an atomic mass unit or AMU is a physical constant equal to one-twelfth of the mass of an unboundatom of carbon-12. ... The symbol for the unit is u (unified atomic mass unit) or Da (Dalton), although AMU may still be used.

3.Atomic mass of an element is the relative mass of its atom as compared with the mass of a carbon-12 atomtaken as 12 units. Hence, atomic mass of oxygen is 16 u means that one atomof oxygen is 16 times heavier than 1/12 of a carbon-12 atom. Atomic mass of oxygen is 16 means thatmass of an oxygen atom is 16 u.

2.The atomic mass of a single atom is simply its total mass and is typically expressed inatomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has anatomic mass of 12 amu.